In: Discrete Mathematics, 2012, vol. 312, no. 7, p. 1372-1385
The vertex colouring problem is known to be NP-complete in the class of triangle-free graphs. Moreover, it is NP-complete in any subclass of triangle-free graphs defined by a finite collection of forbidden induced subgraphs, each of which contains a cycle. In this paper, we study the vertex colouring problem in subclasses of triangle-free graphs obtained by forbidding graphs without cycles, i.e.,...
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In: Lecture Notes in Computer Science, 2016, vol. 9843, p. 229-240
An upper dominating set in a graph is a minimal (with respect to set inclusion) dominating set of maximum cardinality. The problem of finding an upper dominating set is generally NP-hard, but can be solved in polynomial time in some restricted graph classes, such as P4-free graphs or 2K2-free graphs. For classes defined by finitely many forbidden induced subgraphs, the boundary separating...
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In: Algorithmica, 2018, vol. 80, no. 10, p. 2799-2817
Anupper dominating set in a graph is a minimal dominating set of maximum cardinality. The problem of finding an upper dominating set is generally NP-hard.We study the complexity of this problem in finitely defined classes of graphs and conjecture that the problem admits a complexity dichotomy in this family. A helpful tool to study the complexity of an algorithmic problem is the notion of...
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In: Journal of Graph Theory, 2017, vol. 88, no. 1, p. 18-39
An induced matching 𝑀 in a graph 𝐺 is dominating if every edge not in 𝑀 shares exactly one vertex with an edge in 𝑀. The DOMINATING INDUCED MATCHING problem (also known as EFFICIENT EDGE DOMINATION) asks whether a graph 𝐺 contains a dominating induced matching. This problem is generally NP-complete, but polynomial-time solvable for graphs with some special properties. In...
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